Sortable / Filterable Content site map

I have a website which has (among other things) a large list of items, lets say 150, that the user can sort or filterusing a number of options. The filter/sort options that the user selects is then passed in the url as a query stringto reduce the list and only display the items matching the criteria.

When I run the sitemap generator, it creates mappings for every filter option and therefore lists many of the itemsnumerous times because they would show up in more than one of the filtering/sort-by selections.

My question is, Should I leave the map this way with a lot of duplicated content ? or is there a way to avoid the sitemap generator from following links generated by the filtering / sort-by options(buttons) ?